my hyundi san fe ,2011 ,s losing its fob program .ever so often,can't open doors

Hello, seek guidance from a repair facility near you. All you can do is ensure the batteries are good, and that you're not around excessive radio frequency interference near you. A key fob will never "lose it's program", as the vehicle transceiver is what reads the fob, not the other way around. The fob is static, but the transceiver reads it.